passing interface

package testJava;

interface Worker
{
    public void work();
}

class Employer
{
    public void askForWork(Worker worker)
    {
        worker.work();
    }
}

public class Main
{
    public static void main(String[] args)
    {
        Employer employer = new Employer();
        employer.askForWork(new Worker()
        {
            @Override
            public void work()
            {
                System.out.println("I'm working!");
            }
        });
        employer.askForWork(new Worker()
        {
            @Override
            public void work()
            {
                System.out.println("I'm working too!");
            }
        });
    }
}